Add io::read_new_fully for reading to the end of a stream. Add io::wrap_bytes for reading bytes with io functions.

lib/std/io/io.c3

@@ -401,3 +401,11 @@ fn File* stdin()
 {
 	return &stdin_file;
 }
+
+/**
+ * Wrap bytes for reading using io functions.
+ **/
+fn ByteReader wrap_bytes(char[] bytes)
+{
+	return { bytes, 0 };
+}

lib/std/io/stream.c3

@@ -77,6 +77,22 @@ macro usz! read_all(stream, char[] buffer)
 	return n;
 }
 
+/**
+ * @require @is_instream(stream)
+ */
+macro char[]! read_new_fully(stream, Allocator allocator = allocator::heap())
+{
+	usz len = available(stream)!;
+	char* data = allocator::malloc_try(allocator, len)!;
+	defer catch allocator::free(allocator, data);
+	usz read = 0;
+	while (read < len)
+	{
+		read += stream.read(data[read:len - read])!;
+	}
+	return data[:len];
+}
+
 /**
  * @require @is_outstream(stream)
  */